Attrition mill



, 1930; E. H. HUSSEY 1,744,226

ATTRITION MILL Filed March 1928 Patented 2!, 19301 I @UNITED STATES PATENT OFFICE :eawm n. nussn or mnmnaroms, mmnnsorn, AssIGnon. TO THE BAUER nno'rnnns 1 GOMPA1'VY ,QF IELD, OHIO, AJCOIRPOMTION" 0F 02811;)

1 J Application filed March 8,

This invention relates to, mills tor making pulp from wood or other'fibrous materials and in which are-employed opposed relatively movable disks, it 'inore particularly relating to the formation of the working faces of the An object of the invention isto provide disks'having teeth or ribs so formed that the material passing between the same will be rolled, pressed and rubbed without cutting;

a more specific object in this connection being to provide opposed teethwhich are inclined from base to point in a direction'opposite to the direction of rotation of the disk upon which they are located.

A further object of the invention is to pro-' vide disks having teeth or ribsso formed as to impart an initial disintegrating action upon the material and to thereafter roll, squeeze and rub the material to a pulped condition. Referring'tothe drawings:- a

Fig. 1 is a vertical section through so much of an attrition mill as is necessary to illustrate this invention.

Fig. 2 is an, elevation of the workingface of one of the segmental plates forming the working surfaces of the disks.

Fig. 3 is an enlarged detail section on the line 33 of Fig. 2.

, Fig. 4 is an enlarged line 4-4 of Fig. 2.

. Fig. 5 is an enlarged detail section on the detail section on the Fig.6 is an enlarged detail section on the line e-e of Fig. 2.

Fig. 7 is an enlarged detail section on the line 77 of Fig. 2.

Fig. 8 is an enlarged detail section of two v, U opposing plates showing the'teeth arranged material.

to impart a disintegrating action upon the Fig. 95is an enlarged detail section of two opposed plates showing the teeth inclined to impart a rolling, squeezing and rubbing ac- Y tion upon the material. v

Referringto the draw1ngs,.1 and 2 represent the heads of the disks, connected respec- ATTRI'EION '9 1928. Serial No. 260,135.

sources. ojpower (not shown), although the invention is equally available to an arrangement, in which one of thedisks isstationary Thematerial is fed and the other rotatable: from a chute 5 through the central eyes 6 in the head 1 and is fed outwardly betw'een the disks-by centrifugal force and discharged at the periphery. Each of the disks has secured thereto a series of segmental plates-.7, the

plates of both disks-being constructed the same. The teeth all extend radially or substantially so and are arranged'in rows. The inner row of teeth is indicated .at'8 and is shown in Figs. 7 and 8, these teeth each having one of their sides inclined from base to point in'the general direction of rotation, as a result of which the points or sharp edges of the teeth or opposing plates co-act to first disintegrate the material. The outer faces of the'se teeth, as well as a portion of the outer faces 'of the subsequent rows of teeth, are inclined. so as to provide an outwardly converged throat between the opposing disks at this point In the subsequent rows'of teeth, which are indicated at 9, 10, 11 and 12, and which are shown in detail in Figs. 4, 5, 6 and 9, the

. teeth each have one; of their sides inclined I from base to point oppositely to the eneral a,

direction of rotation. The disks are a justed so that the teeth 10, 11 and 12 and the straightportion of the teeth 9 on one disk nearly touch the corresponding teeth on the opposing plate, whereby the inclined surfaces of opposing teeth act upon the material to roll,

s ueeze and rub the same. In the production o pulp from wood or other material the aei n tion of disintegrating, squeezing, rollin rubbing is erformedin the resence of ater which is a mitted at the pace indicated by 15 and also through the chute With the material. The distancebetween the teeth ofisub sequent rows decrease,.those of the inner row being the greater distance apart and those of the outer row the lesser distance apart.

,are preferably placed eccentric ribs 13 which Between the rows of teeth 9, 10,11 and 12 I act to retard the flow of the material between the disks and to throw the material into confor more complete tact with the opposite disk other fibrous ,material, the material; after beingjnitially reduced or disintegrated by preliminary disintegration. (not shown), is fed to the disks just described with the result that the material is first further disintegrated and then rolled, rubbed andsqueezed in the presence of water so that the material is thoroughly reduced and hydrated so that it comes out in a perfectly pulped condition.

ile the inner row only in the present instance has been shown provided with teeth of a disintegrating character, that is, teeth having their inclinations in the general direction, of rotation, it is to be understood that such form of teeth may be provided in the one or more subsequent rows instead of teeth inclined oppositely to the direction of rotation in some cases where the nature of the material and quality of the pulp desired, as well as the required hydration demand it. In other words, the number of the disintegrating teeth may beproportiorfately greater to the rolling ksqueezing and rubbing teeth if desired.

While the teeth shown are of a form having a sharp edge, it is to be understood thatthese teeth, or ,a part of them, may be of this form butfhaving a rounded to J By having the teeth or ribs which act final-v ly upon the material so formed that they will secured with other forms of pulping apparaof said disks which cooperate with the teeth .tus. The teeth which perform this final operation being inclined from base to pointin a direction opposite to that of the rotation of the disks, it' will be seen that the action is to roll, squeeze, press and rub the material between the inc ned faces of the teeth, which acts to reduce the cross-section of the fibrous inateil'lial but doesnot cut the material as to en t V aving thus described my invention I claim:

1. In a mill of the character described, opposed relatively movable disks, teeth on each of the other disk, said teeth being so inclined,

p and disposed with relation to the teeth of the other disk as to-roll, rub and crush the material between opposed teeth without cutting the material.

2. In a mill of the character described, opposed relatively movable disks, said disks being arran d to receive the material at the center an discharge it, at the periphery,

my hand this 6th means on said disks for imparting an initial disintegrating action to the material, and teeth on said disks cooperating with the teeth of the other disks andso inclined and disposed relatively-movable disks, a series of rows of elongated teeth on each of said disks,

radially arranged with the distance between the teeth gradually increasin from the center to the periphery of the @sks, the inner teeth-being so inclined as to cause opposing disks to disintegrate the material and the other teeth being so inclined and disposed with relation to the teeth of theother disk as to cause the material to be rolled, crushed and rubbed between opposing teeth without cutting the material;

4. In a mill of the character described, opposeddisks, teeth on said disks which extend substantially in a radial direction, those teeth which initially act upon the material.

being inclined from base to tip in the direction of rotation and the teeth which subsequently act upon the material being inclined from base totip oppositely to the direction of rotatibn.

5. In amill of the character described, opposed oppositely rotating disks, a series of rows of teeth radially arranged upon each disk, those teeth nearest the center of theirdisk being formed to disintegrate the material and the balance of the teeth being inclined from base to tip oppositely to the direction of rotation of said disks.

6. In a mill of the character described, op-

posed relatively movable disks, a 'row of elongated teeth radially arranged on each disk to oppose each other, said teeth being inclined from base to tip oppositely to the l direction of rotation of the disk upon which they are carried.

7.In a mill of the character described, a pair of opposed relatively movable disks, a plurality of teeth on each disk with the teeth of one disk arranged in opposition to the teeth of the other disk, said teeth having opposed surfaces so disposed with respect to the direction of revolution as to be free from effective cutting edges and adapted to roll and press the material between the same without cutting the same. I

In testimony whereof, I have hereunto set day of March, 1928.

ERWIN H. HUSSEY. 

